Normal for guy to leave a bar promptly when an ex makes herself present?

I went to a bar tonight and spent the evening there today cause I had some cash to spare and was pretty bored/sending off a best friend for almost a week. I ran into a guy I had a thing with a month or 2 ago where we lost it to each other...

It ended roughly, and I completely ignored him/didn't make eye contact at all with him all night. I saw him standing outside alone at 11ish alone, waiting for a taxi